Pipe-wrench



E. BOWEN PIPE WRENCH. Arrucmou FILED SEPT. 29 m9.

1,354,722, Patented Oct. 5, 1920.,

UNITED STATES PATENT OFFICE.

EZRA BOWEN, OF BERKELEY, CALIFORNIA.

PIPE-WRENCH.

T 0 all whom it may concern:

Be it known that I, EZRA BownN, a citizen of the United States,-residingat Berkeley, in the county of Alameda and State of Galifornia, haveinvented certain new and useful Improvements in PipelVi*e11cl1es, ofwhich the following is a specification, reference being had to theaccompanying drawings.

This invention relates to pipe wrenches, and the general object of theinvention is to provide an extremely simple pipe wrench adapted to itdifferent sizes of pipe without the necessity of using relativelymovable clamping aws and attendant mechanism.

A. further object is to provide a wrench which may be made so as toengage pipes of different standard sizes.

A further object is to provide a pipe wrench having a hook-shaped orcurved terminal end provided with teeth, the shank of the wrench beingso formed that when it is applied to a pipe of the proper size, theshank will force the pipe into engagement with the teeth, the teeth willbite into the pipe and the wrench will bind upon the pipe upon arotation of the wrench.

Other objects will appear in the course of the following description.

Miy invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevation of one formof wrench constructed inaccordance with my invention t Fig. 2 is a perspective view of the formof wrench shown in Fig. 1;

Fig. 3 is a perspective view of a modified form of wrench.

Fig. 4 is a fragmentary elevation of another modified form; and,

Fig. 5 is a view in perspective of the bushing, as disclosed in Fig. 4.

In the drawings I have illustrated three different forms of myinvention, the simplest of which is shown in Fig. 1. In this figure, itwill be seen that the pipe wrench comprises a bar of steel formed toprovide a shank 10, this shank at one end being laterally curved orbowed, as at 11, and then reversely curved, as at 12, so as to form ahook, the inner face 13 of which is directed toward the shank. Theextremity of the bill of this hook is formed with teeth 14 and the shankimmediately opposite the extremity has a relatively flat andlongitudinally extending face 15.

"When this wrench is applied to a pipe of Specification of LettersPatent.

, pipe will Patented Oct. 5, 1920. 29, 1919. Serial No. 327,058.

the proper size, the pipe is embraced between the teeth 14 and the face'15, as illus trated in F 1g. 2, and then power is applied to the wrenchin the direction of the arrow 111 Fig. 2, which will cause the pipe tobe wedged against the teeth and the teeth to blte lnto the pipe and thusthe wrench and be caused to turn together. A reverse movement of thewrench will release the pipe from its engagement therewith.

In Fig. 3I illustrate a modified form of my lnvention, wherein theextremity of the hook 12 is provided with two sets of teeth 14. and 14,the teeth 14 being adapted to embrace another sized pipe from that actedupon by the teeth 14. Otherwise than this, the construction illustratedin Fig. 3 is exactly the same as that illustrated in Fig. 1. I do notwish to be limited to a pair of these teeth 14 and 14 as still moreteeth may be placed upon the end of the hook. Each of these sets ofteeth is adapted to engage two sizes of pipe and thus it will be obviousthat "a wrench constructed in accordance with Fig. 3, but having morethan two sets of teeth, may be adapted to engage pipes having a largerange in diameter.

In Fig. 4 I show still another form of my invention wherein the shank 10has the same form as hereinbefore described, and is provided with thebill 12 of the form previously illustrated, and having teeth 14".

B denotes a bushing adapted to be de tachably engaged with the workingface of the shank of the bill 14, and each side margin of said bushing Bis provided with a wing or flange 16 to overlay a side face of saidshank, so that the bushing is effectively maintained in appliedposition. The bushing is longitudinally curved to closely conform to thecurvature of the working face of the bill 12, and this bushing B may bequickly applied when it is desired to employ the wrench in connectionwith pipes of different sizes.

In practice it is preferred that a wrench constructed in accordance withan embodiment of my invention be of soft steel, so that there will be nodigging of the wrench into the pipe or other work with which it isengaged.

From the foregoing description, it is thought to be obvious that a pipewrench constructed in accordance with my invention is particularly welladapted for use by reason of the convenience and facility with which itmay be assembled and operated and it will also be obvious that myinvention is susceptible of some change and modification withoutdeparting from the principles and spirit thereof and for this reason Ido not wish to be understood as 'limiting-myself to the precisearrangement and formation of then curvedfaround and downward in theopposite direction" to form a hook and reduced in thickness at theextremity of the hook, the extremity of the hook extending inward towardthe shank and being formed to provide a toothed biting edge, the teethextending toward the inner face of the shank. f s V 3; A pipe wrenchcomprising a single shank formed at its extremity with a hook,

the extremity of the hook facing toward the inner face of the shank, theextremity of said hook onthe inner face thereof being formed to providea plurality of series of cutting teeth each projecting from the innerface of the hook a different distance from the teeth of any other seriesand facing toward the inner face of the hook.

4. A pipe wrench comprising a shank bent at one end to form a hook, theextremity of the hook extending inwardly toward the shank and beingformed'with a biting edge, and a bushing adapted to be disposed upon theinner face of the shank opposite the hook and formed with means toembrace the shank and hold the bushin in place.

5. A pipe wrench comprising a shanL bent at one end to form a hook, theextremity of the hook extending inwardly toward the shank and beingformed with a biting edge, and a bushing adapted to be disposed againstthe inner face of the shank opposite the hook, said bushing extendingalong the inner face of the shankand at its extremity abutting a ainstthe inner face of the hookshaped portion and the bushing being providedwith two ears embracing the shank.

In testimony whereof I hereunto affix my signature.

EZRA BOWVEN.

